You don't need to, on the ballast one part of the harness should plug into your headlight plug, it relays the ballast so it thinks it's on. You grab a fused power and ground, plug in the light and drive. If you get a universal kit you may have two plugs for the hid bulb, just zip tie the unused one up, stick a little dielectric grease and ride. If U put in a 10 sec relay, grab the , I think it's blur, low lamp power + to trigger the relay.